The Distinction Between Meter Proving & Testing

Meter proving is when a prover tests and verifies the accuracy of a meter irrespective of whether computerized , also known as SMART technology, or analog. When we talk about meter proving there are plenty of elements and the data files can vary on a whim depending on the particular meter and method of testing. Basically, it’s a gas meter prover for gas meters. Many meter provers will confirm their readings against a preset array as defined in the guides..

Meter proving and meter testing are different. Here’s why.

For starters meter proving happens where a specialist measures the accuracy and reliability of the meter itself. Meter proving in Kindersley is carried out by checking the service meter against a certified prover (dynamic or tank prover, master meter) which is trackable to a national meteorology institute similar to NIST. Among the the majority of popular types of proving is for liquid hydrocarbon and this is frequently the case in pipelines transporting the gas. Exclusive prover connections are necessary for the metering station that will allow parallel measurement of the liquid in the two devices.

Though meter testing has been available more than 100 years the unchanging standard prevails presently as it did in the past. This makes testing through this method is predisposed to lots of different variants and insecurities.

A gas meter prover is a unit that verifies the precision of a gas meter. Municipal and public works are certainly the many widespread employers of meter provers.The responsibility of a meter prover is almost always to basically move a specified amount of air through the meter and checking that with the meter’s own register. When that is done the prover (meter) then takes the data he/she captured in the per cent of air directed to that of the value showed on the meter’s own.

Image courtesy of Harvest

A bell prover has two levels, one inside tank enclosed by yet another external shell. There are two tiers and while the outside layer is typically filled up with oil, the internal layer is known as the bell. The fluid can possibly there be to behave as an air-tight seal for testing. Bell provers are typically counter-weighted to give pressure level that is positive to a line and valve fastened to a meter. We often see wheels on the bell that makes it possible for soft linear movement devoid of risk of jeopardizing the pressure developed by the bell seal moving.

Errors in proving by operators is believe it or not common and must certainly be regarded and adapted. Temperature inconsistencies between the bell air, meter and linking hose pipes could account for many meter proof errors. hardware, human, loose pipes and connections, are Each things that can also be the culprit for inconsistencies.

As we earlier exhibited, each gas type features its own way of meter testing. Natural gas for instance involves a couple of visual inspections just before the PACs are utilized. There are a plethora of other testing methods outside the scope of this article. There are times, orifice meters are transported off-site for confirmation to primary reference devices in laboratory-type facilities, but this testing is pricey and seldom able to duplicate the field factors that affect meter accuracy.

Even climate variations like in the case of meter proving in Drayton Valley, can dramatically affect the results.

The natural advancements of the computerized bell and PAC controls guided itself to the the application of vacuum driven provers with arrays of sonic nozzles (employing choked flow to provide precise flow rates. This also not only is an advancement in full automation but also savings as it eliminates the need for a bell given testing is done through nozzles and pipes. Testers using vacuum to verify flow rates will apply the Bernoulli’s principle. Computers and PAC components automate the function, and the majority of sonic nozzle provers are capable of displaying not only meter proofs to a user, but are also capable of transmitting proofs as well as some other important data to database systems across a computer network.

This article was written with insights from Harvest Oilfield Services, a company specializing in boilers in Whitecourt, Canada.